Structural strengthening method for beam, column, slab

Common structural strengthening methods for beam, column, slab: sticking steel plate, bonded FRP composite materials, post installed anchoring, enlarged section.

Slab strengthening

Cast-in-place plate

Prefabricated plate

Sticking steel plate +d10 anchor bolt

Bonding carbon fiber reinforced polymer FRP composites

New cast-in-place slab

Post installed anchoring with injectable mortar + angle steel support, planting bar + shear reinforcement

injectable mortar

New cast-in-place slab strengthening

Column strengthening

Insufficient bearing capacity of column under normal pressure	Increase section, main reinforcement and stirrups.
	Wet method of externally bonded steel: modified epoxy adhesive infusion + protective coating (cement mortar plaster)
	Continuous bonding of carbon fibers along the full length of the ground (circumferential girding)
Insufficient bearing capacity of inclined section under column compression	CFRP strengthening, the fiber direction should be perpendicular to the longitudinal axis of the column.
Insufficient bearing capacity under large eccentric compression	CFRP strengthening, the fiber direction is aligned with the longitudinal axis of the column.
Column ductility insufficient seismic strengthening	CFRP strengthening, the circular bonding and bonding fiber composite material forms the circumferential girth as the additional stirrup.
Normal section reinforcement (water tower, water tank and closed structure) of tensile members	The fiber composite is externally bonded to the concrete surface of the tensile part, and the direction of the fiber is consistent with the tensile direction.
	The outer steel plate is on the concrete surface of the tensile part, and the direction of the steel plate is consistent with the direction of the pulled steel bar.
New cast-in-place column	Planting steel bar main reinforcement + shear reinforcement + stirrups.

Column beam strengthening

Beam strengthening

Insufficient bearing capacity of the beam moment	1. enlarging the cross section to form the composite beam, planting the main reinforcement and the stirrup
	2. externally bonded steel
	3. bonding FRP composites
	4. sticking steel plate
Insufficient bearing capacity of the negative bending moment at the end of the beam	5. bonding FRP composites
	6. sticking steel plate
	7. grouting the end of the beam with armpit, adding the axillary inclined bars and stirrup
Insufficient shear bearing capacity of beam end and oblique section	8. bonding FRP composite hoop
	9. stick steel plate hoop
	10. add steel corbel
	11. additional shear reinforcement
Adding concrete beams	12. planting steel bars with positive and negative main reinforcement, and Liang Duan setting up steel corbel.

Seismic strengthening

Insufficient column ductilit	Circumferentially bonded fiber composite material constitutes a circumferential bundle, as an additional stirrup
Frame joints improve seismic construction measures	Beam end plate support

Beam end plate support